Vulnerability-Lookup

GHSA-MX4J-WM6M-3MXR

Vulnerability from github – Published: 2025-10-09 12:30 – Updated: 2026-02-03 15:30

Details

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: increase scan_ies_len for S1G

Currently the S1G capability element is not taken into account for the scan_ies_len, which leads to a buffer length validation failure in ieee80211_prep_hw_scan() and subsequent WARN in __ieee80211_start_scan(). This prevents hw scanning from functioning. To fix ensure we accommodate for the S1G capability length.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39957"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-09T10:15:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: increase scan_ies_len for S1G\n\nCurrently the S1G capability element is not taken into account\nfor the scan_ies_len, which leads to a buffer length validation\nfailure in ieee80211_prep_hw_scan() and subsequent WARN in\n__ieee80211_start_scan(). This prevents hw scanning from functioning.\nTo fix ensure we accommodate for the S1G capability length.",
  "id": "GHSA-mx4j-wm6m-3mxr",
  "modified": "2026-02-03T15:30:20Z",
  "published": "2025-10-09T12:30:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39957"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dbad5f5549e54ac269cc04ce89f212892a98cab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16c9244a62116fe148f6961753b68e7160799f97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32adb020b0c32939da1322dcc87fc0ae2bc935d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e2f3213e85eba00acb4cfe6d71647892d63c3a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93e063f15e17acb8cd6ac90c8f0802c2624e1a74"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-39957 (GCVE-0-2025-39957)

Vulnerability from cvelistv5 – Published: 2025-10-09 09:47 – Updated: 2026-08-05 12:06

Title

wifi: mac80211: increase scan_ies_len for S1G

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: increase scan_ies_len for S1G Currently the S1G capability element is not taken into account for the scan_ies_len, which leads to a buffer length validation failure in ieee80211_prep_hw_scan() and subsequent WARN in __ieee80211_start_scan(). This prevents hw scanning from functioning. To fix ensure we accommodate for the S1G capability length.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/93e063f15e17acb8c…
https://git.kernel.org/stable/c/32adb020b0c32939d…
https://git.kernel.org/stable/c/0dbad5f5549e54ac2…
https://git.kernel.org/stable/c/7e2f3213e85eba00a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 93e063f15e17acb8cd6ac90c8f0802c2624e1a74 (git) Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 32adb020b0c32939da1322dcc87fc0ae2bc935d1 (git) Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 0dbad5f5549e54ac269cc04ce89f212892a98cab (git) Affected: 0333a81bc83431d7f90391d38aa09e856c5e5b25 , < 7e2f3213e85eba00acb4cfe6d71647892d63c3a1 (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.108 , ≤ 6.6.* (semver) Unaffected: 6.12.49 , ≤ 6.12.* (semver) Unaffected: 6.16.9 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "93e063f15e17acb8cd6ac90c8f0802c2624e1a74",
              "status": "affected",
              "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25",
              "versionType": "git"
            },
            {
              "lessThan": "32adb020b0c32939da1322dcc87fc0ae2bc935d1",
              "status": "affected",
              "version": "0333a81bc83431d7f90391d38aa09e856c5e5b25",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
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          ]
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.108",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.49",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.9",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: increase scan_ies_len for S1G\n\nCurrently the S1G capability element is not taken into account\nfor the scan_ies_len, which leads to a buffer length validation\nfailure in ieee80211_prep_hw_scan() and subsequent WARN in\n__ieee80211_start_scan(). This prevents hw scanning from functioning.\nTo fix ensure we accommodate for the S1G capability length."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The failure is reached by initiating a scan on the local host \u2014 `nl80211_trigger_scan` over netlink (or an internal mac80211/mlme scan) \u2014 not by processing any received frame. No remote or adjacent peer input is involved in triggering the undersized-buffer condition.\nAC:L - The miscalculation is deterministic: on any S1G-capable hardware doing a hardware scan, `ieee80211_build_preq_ies()` always overruns the `scan_ies_len` budget and fails, firing the WARN and passing an uninitialized request to the driver every single time. No race, timing, or memory-layout condition is required.\nPR:L - `NL80211_CMD_TRIGGER_SCAN` is gated by `GENL_UNS_ADMIN_PERM`, i.e. `ns_capable(net-\u003euser_ns, CAP_NET_ADMIN)`, which is the user-namespace-aware check and therefore reachable by a low-privileged local user rather than requiring real root; in practice scans are also driven continuously by wpa_supplicant/NetworkManager on behalf of ordinary desktop users.\nUI:N - No victim action is needed \u2014 a scan request alone triggers the path, and on affected hardware normal automatic scanning at boot or after connection loss hits it with no user involvement at all.\nS:U - The uninitialized-value use and the WARN both occur within the kernel\u0027s own security authority in net/mac80211 and the wireless driver; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Because `ieee80211_prep_hw_scan()` returns before assigning `req.ie_len`/`req.mac_addr`/`req.mac_addr_mask` yet `__ieee80211_start_scan()` still calls `drv_hw_scan()`, drivers copy `req-\u003eie_len` bytes (uninitialized kmalloc heap value, effectively unbounded) out of the IE buffer into a probe request that is transmitted over the air, disclosing arbitrary adjacent kernel heap memory.\nI:N - All IE emission is bounds-checked via `skb_tailroom()`/`end - pos` guards, so no out-of-bounds write or kernel data modification occurs; the uninitialized length yields only reads.\nA:H - `WARN_ON(!ieee80211_prep_hw_scan())` fires on every scan attempt, which is a kernel panic on the many hardened/embedded builds running `panic_on_warn`, and the subsequent unbounded read driven by the uninitialized `ie_len` can fault or trigger an enormous allocation; hardware scanning is rendered permanently non-functional."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:06:27.822Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/93e063f15e17acb8cd6ac90c8f0802c2624e1a74"
        },
        {
          "url": "https://git.kernel.org/stable/c/32adb020b0c32939da1322dcc87fc0ae2bc935d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/0dbad5f5549e54ac269cc04ce89f212892a98cab"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e2f3213e85eba00acb4cfe6d71647892d63c3a1"
        }
      ],
      "title": "wifi: mac80211: increase scan_ies_len for S1G",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39957",
    "datePublished": "2025-10-09T09:47:34.933Z",
    "dateReserved": "2025-04-16T07:20:57.149Z",
    "dateUpdated": "2026-08-05T12:06:27.822Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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